<template>
  <view>
    <my-search @click="gotoSearh"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',active == i ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block>
        
      </scroll-view>
       <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true"  :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">\ {{item2.cat_name}} \</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  // 导入自己封装的 mixin 模块
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
       this.getCateList()
    },
    methods:{
      async getCateList(){
         // 发起请求
            const { data: res } = await uni.$http.get('/api/public/v1/categories')
            // 判断是否获取失败
            if (res.meta.status !== 200) return uni.$showMsg()
            // 转存数据
            this.cateList = res.message
            this.cateLevel2 = res.message[0].children
      },
      activeChange(i){
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop == 0 ? 1:0
      },
      gotoGoodsList(item){
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?cid=" + item.cat_id
        })
      },
      gotoSearh(){
        uni.navigateTo({
          url:"/subpkg/search/search"
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #FFFFFF;
          position: relative;
        &:before {
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    padding: 15px 0;
    text-align: center;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      width: 33.3%;
      margin-bottom: 10px;
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
}
</style>
